
  /* 头标签放在了base里 */
  .nav {
    height: 120px;
    border-bottom: 1px solid #ccc;
  }
  
  .banner {
    height: 600px;
    margin: 20px auto;
  }
  
  .banner .item {
    background-position: center;
    background-size: 1920px 580px;
    background-repeat: no-repeat;
  }
  
  .header > span {
    font-size: 20px;
    position: absolute;
    height: 20px;
    right: 50px;
    top: 50%;
    margin-top: -10px;
  }